I hope they will include internal exchange also as the payouts in BTC, ETH or USDT is not that much. And they have relatively high withdrawal fees. With internal exchange, we can change it to other alts like TRX which has very minimal fee. But of course, I understand if there are other priorities lined up.
If devs will implement internal token exchanges, then of course TRX is suitable. The fees in this coin are small and this makes it more and more popular. Of course, this disgrace with the commission of both ethereum and bitcoin over the past 9 months has turned many away from using these cryptocurrencies for micropayments.
And in the long term, if you expect that BFG will included in the listing of large exchanges, then should probably take a closer look at BNB as well.
They already stated a couple of times that they have no plans to implement an internal exchange, so I wouldn't hope on that.
Withdrawal fees are quite low, especially compared to other sites. Fee to withdraw bitcoin (slow option) is 0.000075 BTC, which is acceptable. Only fee that is quite high is for ETH (0.005 ETH).